This is the Riemann solver, which takes the $q$ values stored in the
arrays ql and qr and returns the waves in the array
wave and speeds in the array s that result in solving the
Riemann problem at each cell interface, and the fluctuations amdq
and apdq. See $CLAW/doc/rp1.html for more information about 1d
Riemann solvers.

Data files

This file contains a number of
parameter values that are used by CLAWPACK.
The values in this file are read by the library routine
clawpack/1d/lib/claw1ez.f[.html].
Each line contains one or more values to be read
in, followed by comments that are ignored by the Fortran code but
may be used by Pythons scripts.

Some parameters that you might want to modify are described in the
documentation .